Attracting two million people annually, Mount Rushmore National Memorial, near Keystone, South Dakota, is a monumental granite sculpture located within the United States Presidential Memorial. It represents the first 150 years of the history of the United States of America with 60-foot sculptures of the heads of former U.S. Presidents George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln. The entire memorial covers 1,278 acres. It is managed by the National Park Service, a bureau of the United States Department of the Interior.